DM74AS163N Binary Counter 4-Bit 16-DIP Equivalent & Substitute Parts

Part Overview

The DM74AS163N is a 4-bit binary counter IC manufactured by onsemi, housed in a 16-DIP package. This synchronous counter operates at a maximum count rate of 75 MHz with positive edge triggering and synchronous reset functionality. The device is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance, repairs, and legacy design support. The SN74AS163N from Texas Instruments serves as a direct functional equivalent within the 74AS logic family.

Substiute Parts

DM74AS163N

onsemiIn Stock: 913DM74AS163N Datasheet

Current PartRFQ

SN74AS163N

Texas InstrumentsIn Stock: 2824SN74AS163N Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DM74AS163N is determined by the following criteria:

• Logic Family & Function: Both parts belong to the 74AS logic family and implement identical 4-bit binary counter functionality with one element and 4 bits per element.
• Electrical Characteristics: Matching supply voltage range (4.5 V ~ 5.5 V), operating temperature range (0°C ~ 70°C), and counter direction (Up).
• Timing & Control: Identical synchronous reset, synchronous timing, and positive edge trigger specifications.
• Package Compatibility: Both use 16-DIP (0.300", 7.62mm) through-hole packaging, ensuring mechanical and electrical pin compatibility.
• Base Product Number: Both share the base product number 74AS163, confirming functional equivalence within the 74AS series.

The SN74AS163N qualifies as a direct substitute based on these aligned parameters.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS163N from Texas Instruments is a qualified substitute for the obsolete DM74AS163N. Selection should be based on the following factors:

• Product Status: The SN74AS163N maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete DM74AS163N.
• Regulatory Compliance: The SN74AS163N carries ROHS3 compliance certification, meeting modern environmental and material restriction requirements. Both parts maintain REACH Unaffected status.
• Functional Equivalence: Identical counter specifications, package geometry, and electrical operating parameters ensure direct pin-for-pin compatibility in existing circuit designs.
• Count Rate Consideration: The DM74AS163N specifies a maximum count rate of 75 MHz, while the SN74AS163N specifies 40 MHz. Applications operating at frequencies between 40 MHz and 75 MHz should evaluate timing margins within their specific circuit context.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS163N replace the DM74AS163N in existing designs?

A: Yes. Both parts share identical pin configurations, package dimensions (16-DIP), and core counter specifications. Direct substitution is supported for applications operating within the SN74AS163N's 40 MHz count rate specification.

Q: What is the difference in count rate between these parts?

A: The DM74AS163N specifies a maximum count rate of 75 MHz, while the SN74AS163N specifies 40 MHz. Both operate within the same 4.5 V ~ 5.5 V supply range and 0°C ~ 70°C temperature range. Applications must confirm that their operating frequency does not exceed the SN74AS163N's 40 MHz specification.

Q: Are the packages mechanically identical?

A: Yes. Both parts use 16-DIP (0.300", 7.62mm) through-hole packaging with identical pin spacing and dimensions, ensuring mechanical compatibility on PCBs designed for the DM74AS163N.

Q: What compliance certifications apply to the substitute part?

A: The SN74AS163N is ROHS3 compliant and REACH Unaffected. The DM74AS163N is REACH Unaffected. Both parts carry EAR99 ECCN classification and 8542.39.0001 HTSUS code.

Q: Why is the DM74AS163N listed as obsolete?

A: The DM74AS163N has been discontinued by onsemi. The SN74AS163N from Texas Instruments remains in active production and serves as the recommended equivalent for new designs and legacy system support.